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Surface versus bulk composition of a phosphate glass
Author(s) -
Meisel W.,
Sprenger D.,
Gütlich P.
Publication year - 1994
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740220158
Subject(s) - x ray photoelectron spectroscopy , leaching (pedology) , surface layer , phosphate , polishing , oxygen , layer (electronics) , chemistry , mössbauer spectroscopy , composition (language) , analytical chemistry (journal) , inorganic chemistry , materials science , chemical engineering , metallurgy , environmental chemistry , crystallography , environmental science , organic chemistry , soil science , engineering , soil water , linguistics , philosophy
Transmission and conversion electron Mössbauer spectroscopy as well as photoelectron spectroscopy were applied to study alterations of the surface layer of an iron containing industrial phosphate glass as compared with its bulk. In the surface layer, after polishing and exposure to ambient atmosphere, Fe 2+ is partially oxidized to Fe 3+ . This oxidation, however, does not increase the O/P ratio in this layer, because it goes along with a strong leaching of network modifiers. This leaching leads to a net decrease of the O/P ratio because it overcompensates the relative oxygen increase by Fe 2+ oxidation and by uptake of water.